Three-Output Remote Kit 3A577XA
- Identify kit components, wiring assignments, and output behavior.
- Start, charge, and interpret transmitter status safely.
- Distinguish synchronization, cloning, and unclone procedures.
- Digital multimeter — Check receiver supply voltage and ground integrity before suspecting a radio fault.
- Insulated back-probe leads — Access connector circuits for voltage checks without spreading terminals or shorting adjacent contacts.
- Inspection light — Inspect wire colors, connector condition, and Micro USB plug orientation.
- Wheel chocks — Help secure the trailer before functional testing; keep personnel clear of moving equipment.
Sales kit 3A577XA contains transmitter 3A577BB, receiver 3A577DA, a lanyard, and a charger cable. Its four-pin connection assigns red pin 1 to power, blue pin 2 to PUMP, green pin 3 to DOWN, and white pin 4 to UP. The separate black wire is ground. Receiver supply is 9–30 V DC, with a listed current draw of 20 mA at 12 V.
Hold POWER for at least 2 seconds to turn on the transmitter, releasing it when both LEDs illuminate. It shuts off after 15 minutes without button activity, regardless of receiver status. PUMP operates with both UP and DOWN, but the blank button activates DOWN alone. A rapidly blinking green LED indicates communication; a slowly blinking green LED indicates no communication. Green LEDs remain solid for 1 second at startup.
A red transmitter LED blinking once per second indicates a low battery. Error code 1 also means low battery, with the code represented by red flashes between pauses. During charging, red stays on; completed charging is shown by steady green. Charging takes longer with the transmitter on. Check Micro USB plug orientation and do not exceed 5 lb of insertion force. Use only approved chargers: B20172A for 110–240 VAC or B20173B for 12–24 VDC. The transmitter uses a 3.7 V rechargeable LiPo battery rated for 30–40 hours of continuous use.
Factory transmitter-receiver pairs are already synchronized. For a replacement transmitter, switch both devices off, hold transmitter POWER for more than 10 seconds until the LEDs blink, release POWER, and turn on the receiver. After a few seconds, rapid blinking of only the transmitter's green LED confirms teaching. For cloning, start with both transmitters and receiver off; hold original transmitter A's POWER for 10 seconds until its LEDs blink, then release. On transmitter B, hold UP, DOWN, and POWER until both LEDs blink. Wait for green blinking on both, switch both off, and synchronize one to the receiver. To unclone, start with transmitter and receiver off, hold UP, DOWN, BLANK, and POWER until the LEDs toggle, release, press any button to select a new ID, and synchronize to a new receiver.
The radio specification is 902–928 MHz FHSS at 10 mW. Outputs are rated at 5 A each, sourcing, with a 20 A system maximum. Cloning gives another transmitter the original transmitter's ID; it does not permit simultaneous transmitter operation.
How It Works
Identify the hardware and understand the outputs
Kit 3A577XA contains transmitter 3A577BB, receiver 3A577DA, a lanyard, and a charger cable; the connector assigns red pin 1 to power, blue pin 2 to PUMP, green pin 3 to DOWN, and white pin 4 to UP, with a separate black ground wire. Sourcing outputs supply power to connected loads, so circuit identification and a sound ground path matter; ratings are 5 A each, sourcing, with a 20 A system maximum. PUMP operates with both UP and DOWN, while the blank button activates DOWN alone, so an inactive PUMP during blank-button operation is not itself a fault.
Read transmitter status before replacing parts
Hold POWER for at least 2 seconds and release when both LEDs illuminate; green LEDs remain solid for 1 second at startup, then rapid green blinking indicates communication and slow green blinking indicates no communication. A red LED blinking once per second or error code 1 indicates low battery; charging shows steady red and completion shows steady green, while charging with the transmitter on takes longer. The transmitter shuts off after 15 minutes without button activity regardless of receiver status; use only B20172A for 110–240 VAC or B20173B for 12–24 VDC, check Micro USB orientation, and do not exceed 5 lb of insertion force.
Keep teaching, cloning, and identity changes distinct
Factory pairs are already synchronized; to teach a replacement, switch transmitter and receiver off, hold transmitter POWER for more than 10 seconds until the LEDs blink, release POWER, turn on the receiver, and wait for rapid blinking of only the transmitter's green LED. To clone, start with both transmitters and receiver off, hold original transmitter A's POWER for 10 seconds until its LEDs blink and release, then hold UP, DOWN, and POWER on transmitter B until both LEDs blink; wait for green blinking on both, switch both off, and synchronize a transmitter to the receiver. Cloning copies the original ID and does not permit simultaneous transmitter operation; to unclone, start with transmitter and receiver off, hold UP, DOWN, BLANK, and POWER until the LEDs toggle, release, press any button to select a new ID, and synchronize to a new receiver.
Step-by-Step Procedure
0/7 doneThree-Output Kit Ratings
| Receiver supply and current draw | 9–30 V DC; 20 mA at 12 V |
| Radio | 902–928 MHz FHSS; 10 mW |
| Output rating | 5 A each, sourcing; 20 A system maximum |
| Transmitter battery | 3.7 V rechargeable LiPo; 30–40 hours continuous |
| Inactivity shutdown | 15 minutes |
| Maximum Micro USB insertion force | 5 lb |
Diagnostic Chart
| Symptom | Check | Spec / Expected | Likely cause & fix |
|---|---|---|---|
| The green LED blinks slowly and the trailer does not respond. | Secure the equipment, check receiver supply and ground, and verify that the transmitter belongs to the receiver. If teaching a replacement, perform the synchronization procedure and watch for the confirmation indication. | Receiver supply: 9–30 V DC. Slow green blinking means no communication; rapid blinking of only the transmitter's green LED confirms teaching. | The receiver may lack usable power or the replacement transmitter may not be synchronized. Basis: KTI-Remote-Kit-Instructions |
| DOWN operates from the blank button but PUMP does not. | Confirm which button is being pressed before diagnosing wiring. With the equipment safe to operate, compare blank-button behavior with UP and DOWN operation. | PUMP operates with both UP and DOWN; the blank button activates DOWN alone. | Normal output logic can be mistaken for a failed pump circuit. Basis: KTI-Remote-Kit-Instructions |
| The transmitter flashes red or charging appears incomplete. | Read the red flash pattern, verify the approved charger, and inspect plug orientation without forcing it. Turn the transmitter off while charging and watch for the completion indication. | Red blinking once per second or error code 1 means low battery. Steady red means charging; steady green means complete. Maximum Micro USB insertion force: 5 lb. | The battery may be low; leaving the transmitter on extends charging time, and an incorrectly oriented plug can prevent proper connection. Basis: KTI-Remote-Kit-Instructions |
| Receiver voltage appears normal at rest, but operation is intermittent. | Inspect power and ground connections for looseness, corrosion, and damaged conductors. Compare supply behavior at rest and during a safely commanded operation, and check voltage drop across suspect connections. | No numerical voltage-drop acceptance limit is supplied in this lesson. | Connection resistance can restrict current and cause voltage loss under load even when an unloaded voltage reading appears normal. Basis: General shop practice |
At the Bay: Diagnose the Case
CASE 1 / 4
The green LED blinks slowly and the trailer does not respond.
- Test
- Compare
- Correct
Select the next check
Basis: KTI-Remote-Kit-Instructions. A likely cause is a hypothesis; confirm it with the applicable service procedure before repair.
Common Bay Mistakes
- ✕ Do not mistake blank-button DOWN-only behavior for a PUMP failure.
- ✕ Do not treat the startup solid-green indication as confirmed communication.
- ✕ Do not power cloned transmitters simultaneously.
- ✕ Do not force the Micro USB plug or substitute an unapproved charger.
Quick Check
Practice only — not scored.
Plan the Service Sequence
Planning practice only. Follow the applicable manufacturer's instructions, employer safety program and qualified supervision on real equipment.
Plan the first action. Compare the service steps with the bay mistakes.
Hands-on: Shop Test Equipment
Hydraulic Pressure & Relief Gauge
0–5,000 psi gauge on the pump pressure port, DC clamp meter, battery voltmeter
🛠 Equip your bay for this test →Symptom: Routine check before a customer pickup.
Spec limits used
- 3,200 psi — Primary relief (factory preset) (KTI Hydraulics Troubleshooting Manual 2019)
- 1,500 psi — Secondary relief, circuit 111 (KTI Hydraulics Troubleshooting Manual 2019)
- below 9 V — Low-voltage alarm (KTI remote)
- illustrative only — Motor current & voltage drop (General shop practice)
Simulated readings for practice. Always follow the manufacturer's procedure and values on a real trailer.
Source: KTI-Remote-Kit-Instructions — 1